Today's Message Index:
----------------------
1. 06:28 PM - Do I need a Pull Up resistor? (William Hunter)
2. 08:23 PM - Re: Do I need a Pull Up resistor? (user9253)
3. 09:13 PM - Re: Re: Do I need a Pull Up resistor? (William Hunter)
4. 11:01 PM - Official AeroElectric-List FAQ (Frequently Asked Questions) (Matt Dralle)
5. 11:02 PM - Re: Do I need a Pull Up resistor? (Eric Page)
6. 11:03 PM - Official AeroElectric-List Usage Guidelines (Matt Dralle)
Message 1
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| Subject: | Do I need a Pull Up resistor? |
Hi All,
Still plugging along...I know you all have been pulling for me!!!
The question is...did I buy the wrong magnetic sensor...or...do I need the
"Pull Up Resistor" as shown in the attached "Open Collector Sinking Block
Diagram"?
As a recap on my project
I built a fiberglass air filter box with a small door that will be pop open
if the air filter becomes blocked with ice and I bought a MP1007 Series
Magnetic sensor to monitor my air filter bypass door through my Dynon
Skyview Engine Monitor System.
I am currently bench testing the sensor with it hanging in open air and I
hold a small magnet near the sensor or away from the sensor.
Pin 8 of my Dynon EMS is going to monitor the following two items:
-Dynon Pitot tube heater failure. The Dynon pitot tube control box has a
white wire that is open when the heater is working properly and then when
the heater system is off or failed the system connects the white wire to
ground. Because of the logic of the Dynon pitot heater system I set up the
EMS Pin 8 to watch for a ground and if it sees a path to ground the
indicator on my EMS screen shows an amber dot and the word "ICE" (indicating
a failure of the Dynon pitot tube heater) and when the pin does not register
a path to ground the indicator is black and disappears from the screen.
This setup is working perfectly.
-Air filter door position. This will be monitored by the MP1007 sensor
however the sensor logic is working opposite of what I expected. I thought
the black output wire of the MP1007 sensor would be open when the magnet
target is close to the sensor (like when the air door is closed) and then
when the magnet is pulled away from the sensor (like when the air door pops
open) the black output wire would connect to ground...however it is exactly
opposite meaning magnet close = black wire grounded and magnet away = black
wire is open.
IF...this sensor works like I want it to then the it would work perfectly
and in parallel with my Dynon pitot heater.
I have connected the following wires of the sensor to my airplane system:
Sensor Wire Airplane Wire
BRN Pin 18 of the Dynon EMS system (this is a 5 VDC source)
BLK Pin 8 of the Dynon EMS (this is a "general purpose" sensor
described above)
BLU Ground
The MP1007 sensor instructions state:
Open Collector (NPN)
-Output switches low (off) when the magnetic field at the sensor exceeds the
operate point threshold
-Output switches high (on) when the magnetic field is reduced to below the
release point threshold
Any help or well wishes would be GREATLY APPRECIATED!!!
..
Cheers!!!
Bill Hunter
Message 2
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| Subject: | Re: Do I need a Pull Up resistor? |
Bill,
Do you have a SkyView or D-180 or what?
Do you have to connect the pitot sensor and magnetic sensor to the same EMS input?
Is there another input that you can use?
Yeah, the data sheet is confusing. It says "OFF" when the transistor is actually
on. If you ignore the "ON" and "OFF" and just read the rest of the text, it
makes sense. It sounds like the sensor is working properly, a close magnet
causes the output to go low. If you want the signal inverted, another transistor
can do it.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=471418#471418
Message 3
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| Subject: | Re: Do I need a Pull Up resistor? |
Thanks Joe I knew I could count on you!!!
> Do you have a SkyView or D-180 or what?
Skyview 1000
>Do you have to connect the pitot sensor and magnetic sensor to the same
EMS input? Is there another input that you can use?
I have used all of the input pins so I thought that it would be cleaver to
combine the ice systems into one sensor pin.
>Yeah, the data sheet is confusing. It says "OFF" when the transistor is
actually on. If you ignore the "ON" and "OFF" and just read the rest of
the text, it makes sense. It sounds like the sensor is working properly, a
close magnet causes the output to go low. If you want the signal
inverted, another transistor can do it.
I assume that "another transistor" means I need to buy a "another sensor"?
Do you by chance know what the name of the correct unit will be? Regular
switches are called Normally Open or Normally Open so what would a Normally
Closed sensor be called?
THANKS AGAIN!!!
Bill Hunter
On Aug 1, 2017 8:27 PM, "user9253" <fransew@gmail.com> wrote:
>
> Bill,
> Do you have a SkyView or D-180 or what?
> Do you have to connect the pitot sensor and magnetic sensor to the same
> EMS input? Is there another input that you can use?
> Yeah, the data sheet is confusing. It says "OFF" when the transistor is
> actually on. If you ignore the "ON" and "OFF" and just read the rest of
> the text, it makes sense. It sounds like the sensor is working properly, a
> close magnet causes the output to go low. If you want the signal inverted,
> another transistor can do it.
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=471418#471418
>
>
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| Subject: | Official AeroElectric-List FAQ (Frequently Asked Questions) |
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| Subject: | Re: Do I need a Pull Up resistor? |
Bill,
The data sheet confirms what you're seeing at the bench, but this sensor can be
made to work. The fix is pretty simple -- you just need to invert the output
logic. This can be easily done with a few cheap components.
However, paralleling the inputs to Pin 8 without knowing how the pitot fail signal
works is potentially dangerous. It's possible for one input signal to short
the other one. The two inputs should be isolated from one another so they
can't interact.
See the attached schematic diagram. Resistor R3 provides a weak pull-up on Pin
8, holding it at 5V. When your air door is closed and the sensor output is pulled
to ground, P-MOSFET Q1 is turned on, and both sides of Schottky diode D1
(and therefore Pin 8) are at 5V. When the air door opens, the sensor output
goes high impedance, allowing resistor R1 to turn Q1 off, in turn allowing R2
to overwhelm R3, pulling Pin 8 to ground through D1. D2 prevents the PITOT FAIL
signal from holding Pin 8 at 5V. Likewise, when the PITOT FAIL signal pulls
low through D2, D1 prevents Q1 from holding Pin 8 at 5V.
A couple of notes:
1. This circuit will pull ~5mA from your Dynon's Pin 18 at all times. You should
check that this is within specifications.
2. Please check that your PITOT FAIL signal puts 5V on Pin 8 (when the pitot is
working normally), and not 12V. If it's 12V, then this circuit needs to be changed
slightly: R1 and R2 should be 2.7k, and the connection point labeled DYNON
P18 should instead be connected to 12V.
If you need help building this circuit, just say the word.
Cheers,
Eric
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| Subject: | Official AeroElectric-List Usage Guidelines |
Dear Listers,
Please read over the AeroElectric-List Usage Guidelines below. The complete
AeroElectric-List FAQ including these Usage Guidelines can be found at the
following URL:
http://www.matronics.com/FAQs/AeroElectric-List.FAQ.html
Thank you,
Matt Dralle
Matronics Email List Administrator
******************************************************************************
AeroElectric-List Usage Guidelines
******************************************************************************
The following details the official Usage Guidelines for the AeroElectric-List.
You are encouraged to read it carefully, and to abide by the rules therein.
Failure to use the AeroElectric-List in the manner described below may result
in the removal of the subscribers from the List.
AeroElectric-List Policy Statement
The purpose of the AeroElectric-List is to provide a forum of discussion for
things related to this particular discussion group. The List's goals
are to serve as an information resource to its members; to deliver
high-quality content; to provide moral support; to foster camaraderie
among its members; and to support safe operation. Reaching these goals
requires the participation and cooperation of each and every member of
the List. To this end, the following guidelines have been established:
- Please keep all posts related to the List at some level. Do not submit
posts concerning computer viruses, urban legends, random humor, long
lost buddies' phone numbers, etc. etc.
- THINK carefully before you write. Ask yourself if your post will be
relevant to everyone. If you have to wonder about that, DON'T send it.
- Remember that your post will be included for posterity in an archive
that is growing in size at an extraordinary rate. Try to be concise and
terse in your posts. Avoid overly wordy and lengthy posts and
responses.
- Keep your signature brief. Please include your name, email address,
aircraft type/tail number, and geographic location. A short line
about where you are in the building process is also nice. Avoid
bulky signatures with character graphics; they consume unnecessary
space in the archive.
- DON'T post requests to the List for information when that info is
easily obtainable from other widely available sources. Consult the
web page or FAQ first.
- If you want to respond to a post, DO keep the "Subject:" line of
your response the same as that of the original post. This makes it
easy to find threads in the archive.
- When responding, NEVER quote the *entire* original post in your
response. DO use lines from the original post to help "tune in" the
reader to the topic at hand, but be selective. The impact that
quoting the entire original post has on the size of the archive
can not be overstated!
- When the poster asks you to respond to him/her personally, DO NOT
then go ahead and reply to the List. Be aware that clicking the
"reply" button on your mail package does not necessarily send your
response to the original poster. You might have to actively address
your response with the original poster's email address.
- DO NOT use the List to respond to a post unless you have something
to add that is relevant and has a broad appeal. "Way to go!", "I
agree", and "Congratulations" are all responses that are better sent
to the original poster directly, rather than to the List at large.
- When responding to others' posts, avoid the feeling that you need to
comment on every last point in their posts, unless you can truly
contribute something valuable.
- Feel free to disagree with other viewpoints, BUT keep your tone
polite and respectful. Don't make snide comments, personally attack
other listers, or take the moral high ground on an obviously
controversial issue. This will only cause a pointless debate that
will hurt feelings, waste bandwidth and resolve nothing.
- Occasional posts by vendors or individuals who are regularly
subscribed to a given List are considered acceptable. Posts by
List members promoting their respective products or items for sale
should be of a friendly, informal nature, and should not resemble
a typical SPAM message. The List isn't about commercialism, but
is about sharing information and knowledge. This applies to
everyone, including those who provide products to the entire
community. Informal presentation and moderation should be the
operatives with respect to advertising on the Lists.
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